The authors, in some rare cases of surgical neoplastic icterus operation, had to adopt a technique of biliary-digestive bypass with prosthesis on account of the technical-anatomical and general conditions of the patients. That prosthesis has been made out of the typical Keher's duct which can be generally found in every general surgery. The above mentioned authors describe the operations they have carried out, their directions and the results of six cases which have been treated with a technique similar to Kron's.